Use versionadded instead of note directive

OskarStark · OskarStark · commit 46d3cc7c9cce · 2019-07-30T09:38:13.000+02:00
diff --git a/components/cache/adapters/chain_adapter.rst b/components/cache/adapters/chain_adapter.rst
@@ -58,10 +58,10 @@ incompatible adapters are silently ignored::
         new FilesystemAdapter(),  // DOES implement PruneableInterface
     ]);
 
-    // prune will proxy the call to FilesystemAdapter while silently skipping ApcuAdapter
+    // prune will proxy the call to FilesystemAdapter while silently skip ApcuAdapter
     $cache->prune();
 
-.. note::
+.. versionadded:: 3.4
 
     Since Symfony 3.4, this adapter implements :class:`Symfony\\Component\\Cache\\PruneableInterface`,
     allowing for manual :ref:`pruning of expired cache entries <component-cache-cache-pool-prune>` by
